cd2ee4a30c
This makes SIGWINCH work again, and fixes a couple of SIGWINCH-associated crashes. First, the sigio thread disables SIGWINCH because all hell breaks loose if it ever gets one and tries to call the signal handling code. Second, there was a problem with deferencing tty structs after they were freed. The SIGWINCH support for a tty wasn't being turned off or freed after the tty went away. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
178 lines
3.9 KiB
C
178 lines
3.9 KiB
C
/*
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* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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* Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
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*/
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#include "linux/config.h"
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#include "linux/kernel.h"
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#include "linux/module.h"
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#include "linux/smp.h"
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#include "linux/irq.h"
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#include "linux/kernel_stat.h"
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#include "linux/interrupt.h"
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#include "linux/random.h"
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#include "linux/slab.h"
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#include "linux/file.h"
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#include "linux/proc_fs.h"
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#include "linux/init.h"
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#include "linux/seq_file.h"
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#include "linux/profile.h"
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#include "linux/hardirq.h"
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#include "asm/irq.h"
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#include "asm/hw_irq.h"
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#include "asm/atomic.h"
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#include "asm/signal.h"
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#include "asm/system.h"
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#include "asm/errno.h"
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#include "asm/uaccess.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "irq_user.h"
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#include "irq_kern.h"
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/*
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* Generic, controller-independent functions:
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*/
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j;
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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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seq_printf(p, " ");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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}
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if (i < NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto skip;
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seq_printf(p, "%3d: ",i);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
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#endif
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seq_printf(p, " %14s", irq_desc[i].handler->typename);
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seq_printf(p, " %s", action->name);
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for (action=action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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skip:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == NR_IRQS) {
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seq_putc(p, '\n');
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}
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return 0;
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}
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/*
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* do_IRQ handles all normal device IRQ's (the special
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*/
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unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
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{
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irq_enter();
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__do_IRQ(irq, (struct pt_regs *) regs);
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irq_exit();
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return 1;
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}
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int um_request_irq(unsigned int irq, int fd, int type,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long irqflags, const char * devname,
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void *dev_id)
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{
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int err;
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err = request_irq(irq, handler, irqflags, devname, dev_id);
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if(err)
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return(err);
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if(fd != -1)
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err = activate_fd(irq, fd, type, dev_id);
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return(err);
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}
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EXPORT_SYMBOL(um_request_irq);
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EXPORT_SYMBOL(reactivate_fd);
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static DEFINE_SPINLOCK(irq_spinlock);
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unsigned long irq_lock(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&irq_spinlock, flags);
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return(flags);
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}
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void irq_unlock(unsigned long flags)
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{
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spin_unlock_irqrestore(&irq_spinlock, flags);
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}
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/* presently hw_interrupt_type must define (startup || enable) &&
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* disable && end */
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static void dummy(unsigned int irq)
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{
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}
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static struct hw_interrupt_type SIGIO_irq_type = {
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.typename = "SIGIO",
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.disable = dummy,
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.enable = dummy,
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.ack = dummy,
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.end = dummy
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};
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static struct hw_interrupt_type SIGVTALRM_irq_type = {
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.typename = "SIGVTALRM",
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.shutdown = dummy, /* never called */
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.disable = dummy,
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.enable = dummy,
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.ack = dummy,
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.end = dummy
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};
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void __init init_IRQ(void)
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{
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int i;
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irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
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irq_desc[TIMER_IRQ].action = NULL;
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irq_desc[TIMER_IRQ].depth = 1;
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irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
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enable_irq(TIMER_IRQ);
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for(i=1;i<NR_IRQS;i++){
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irq_desc[i].status = IRQ_DISABLED;
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irq_desc[i].action = NULL;
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irq_desc[i].depth = 1;
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irq_desc[i].handler = &SIGIO_irq_type;
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enable_irq(i);
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}
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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